Bump actions/cache from 2 to 3 (#6112)

Bumps [actions/cache](https://github.com/actions/cache) from 2 to 3.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v2...v3)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/merge.yaml

@@ -63,7 +63,7 @@ jobs:
         ruby-version: 3.0.2
     - name: but use cache to speed that up
       if: github.event_name == 'workflow_dispatch' || (github.event_name == 'push' && (steps.update.outputs.updated == 'true' || steps.update.outputs.deleted == 'true'))
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: vendor/bundle
         key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}

.github/workflows/sheldon.yaml

@@ -54,7 +54,7 @@ jobs:
       with:
         ruby-version: 3.0.2
     - name: but use cache to speed that up
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: vendor/bundle
         key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}